An Australian dietitian says older people are not eating properly - and some are malnourished - because they're dieting.
Ngaire Hobbins is also a lecturer in dementia studies at the University of Tasmania who says many older people are not getting enough protein and other vital nutrients to help their bodies and brains deal with aging beyond 70 years of age.
She says most people don't realise that older people being heavier is usually better than them being very lean.
Her book Eat to Cheat Aging has three different eating plans - one for those still fit, well and active; one for those who have become frail, and another for those somewhere in between.
She talks to Kathryn Ryan.